5 files changed, 23 insertions, 13 deletions
diff --git a/core/compaction-chain.go b/core/compaction-chain.go
index ea26562..ac8c458 100644
--- a/core/compaction-chain.go
+++ b/core/compaction-chain.go
@@ -30,6 +30,8 @@ import (
 var (
 	ErrBlockNotRegistered = fmt.Errorf(
 		"block not registered")
+	ErrNotInitiazlied = fmt.Errorf(
+		"not initialized")
 )
 
 type compactionChain struct {
@@ -49,6 +51,12 @@ func newCompactionChain(gov Governance) *compactionChain {
 	}
 }
 
+func (cc *compactionChain) init(initBlock *types.Block) {
+	cc.prevBlockLock.Lock()
+	defer cc.prevBlockLock.Unlock()
+	cc.prevBlock = initBlock
+}
+
 func (cc *compactionChain) registerBlock(block *types.Block) {
 	if cc.blockRegistered(block.Hash) {
 		return
@@ -67,11 +75,10 @@ func (cc *compactionChain) blockRegistered(hash common.Hash) (exist bool) {
 
 func (cc *compactionChain) processBlock(block *types.Block) error {
 	prevBlock := cc.lastBlock()
-	if prevBlock != nil {
-		block.Finalization.Height = prevBlock.Finalization.Height + 1
-	} else {
-		block.Finalization.Height = 1
+	if prevBlock == nil {
+		return ErrNotInitiazlied
 	}
+	block.Finalization.Height = prevBlock.Finalization.Height + 1
 	cc.prevBlockLock.Lock()
 	defer cc.prevBlockLock.Unlock()
 	cc.prevBlock = block
diff --git a/core/compaction-chain_test.go b/core/compaction-chain_test.go
index 6931674..bffe57a 100644
--- a/core/compaction-chain_test.go
+++ b/core/compaction-chain_test.go
@@ -37,7 +37,9 @@ func (s *CompactionChainTestSuite) SetupTest() {
 func (s *CompactionChainTestSuite) newCompactionChain() *compactionChain {
 	gov, err := test.NewGovernance(4, 100*time.Millisecond)
 	s.Require().NoError(err)
-	return newCompactionChain(gov)
+	cc := newCompactionChain(gov)
+	cc.init(&types.Block{})
+	return cc
 }
 
 func (s *CompactionChainTestSuite) generateBlocks(
@@ -73,15 +75,11 @@ func (s *CompactionChainTestSuite) TestProcessBlock() {
 		}
 		now = now.Add(100 * time.Millisecond)
 	}
-	var prevBlock *types.Block
+	prevBlock := &types.Block{}
 	for _, block := range blocks {
 		s.Equal(cc.prevBlock, prevBlock)
 		s.Require().NoError(cc.processBlock(block))
-		if prevBlock != nil {
-			s.Equal(prevBlock.Finalization.Height+1, block.Finalization.Height)
-		} else {
-			s.Equal(uint64(1), block.Finalization.Height)
-		}
+		s.Equal(prevBlock.Finalization.Height+1, block.Finalization.Height)
 		prevBlock = block
 	}
 }
diff --git a/core/consensus.go b/core/consensus.go
index f4e3295..3601720 100644
--- a/core/consensus.go
+++ b/core/consensus.go
@@ -310,9 +310,10 @@ func NewConsensus(
 }
 
 // Run starts running DEXON Consensus.
-func (con *Consensus) Run() {
+func (con *Consensus) Run(initBlock *types.Block) {
 	// Setup context.
 	con.ctx, con.ctxCancel = context.WithCancel(context.Background())
+	con.ccModule.init(initBlock)
 	go con.processMsg(con.network.ReceiveChan())
 	con.cfgModule.registerDKG(con.round, int(con.currentConfig.DKGSetSize)/3+1)
 	con.event.RegisterTime(con.dMoment.Add(con.currentConfig.RoundInterval/4),
diff --git a/core/consensus_test.go b/core/consensus_test.go
index 39aac7a..94c5018 100644
--- a/core/consensus_test.go
+++ b/core/consensus_test.go
@@ -170,6 +170,7 @@ func (s *ConsensusTestSuite) prepareConsensus(
 	network := conn.newNetwork(nID)
 	con := NewConsensus(dMoment, app, gov, db,
 		network, prvKey)
+	con.ccModule.init(&types.Block{})
 	conn.setCon(nID, con)
 	return app, con
 }
diff --git a/core/lattice_test.go b/core/lattice_test.go
index 603424b..5c06b92 100644
--- a/core/lattice_test.go
+++ b/core/lattice_test.go
@@ -107,9 +107,12 @@ func (s *LatticeTestSuite) newTestLatticeMgr(
 	// Setup governance.
 	gov, err := test.NewGovernance(int(cfg.NotarySetSize), cfg.LambdaBA)
 	req.NoError(err)
+	// Setup compaction chain.
+	cc := newCompactionChain(gov)
+	cc.init(&types.Block{})
 	// Setup lattice.
 	return &testLatticeMgr{
-		ccModule: newCompactionChain(gov),
+		ccModule: cc,
 		app:      app,
 		db:       db,
 		lattice: NewLattice(